ACI CERTIFICATION EXAM QUESTIONS
WITH CORRECT ANSWERS 2025
2. T/F: When the concrete contains large aggregate, the testing technician should wet-
sieve the sample before making unit weight tests for use in yield computations. - CORRECT ANSWER -
False
4. T/F: Samples smaller than 28L (1 cu.ft.) are allowed on routine air content, temperature, and slump t
ests. - CORRECT ANSWER -True
7. How do you regulate the rate of discharge of the batch from the revolving truck drum mixer or agitat
or? - CORRECT ANSWER -By the rate of revolution of the drum
10. While the technician is checking the slump of the concrete, there is a decided falling away or sheari
ng off of the concrete from one side of the sample. What should the technician do? -
CORRECT ANSWER -Disregard the test and retest on another portion of the sample
11. The mold is filled in three equal layers by volume, which makes the first third at , and the s
econd third at . - CORRECT ANSWER -2 5/8, 6 1/8
15. What is the difference allowed by ACI when certifying an individual test using a plastic slump cone v
s. a metal slump cone? - CORRECT ANSWER -0.5 inches
16. T/F: The sides of the slump mold should be lightly tapped to consolidate the concrete in the mold. -
CORRECT ANSWER -False
18. T/F: ASTM C 1064 defines the maximum recommended temperature for concrete. -
CORRECT ANSWER -False
19. The temperature test method must be complete with in after obtaining the sample. -
CORRECT ANSWER -5 minutes
, 20. Each temperature-
measuring device should be calibrated , or whenever there is a question of .-
CORRECT ANSWER -annually, accuracy
23. T/F: After strike off of the measure used to determine density, a small quantity of concrete may be
added to correct a deficiency? - CORRECT ANSWER -False
26. What is the required shape at the end of the tamping rod? - CORRECT ANSWER -
rounded to a hemispherical tip
28. How do you find the density of a concrete batch? - CORRECT ANSWER -
(mass of measure with concrete - mass of measure) / volume of measure
29. How do you find the yield of a concrete batch? - CORRECT ANSWER -
(mass of all materials batched / (density of concrete * 27))
33. T/F: Test method ASTM C231 is intended for use with all concretes and aggregates for which an agg
regate correction factor can be determined - CORRECT ANSWER -False
34. T/F: The petcocks are closed before pumping any air into the chamber on the type B meter. -
CORRECT ANSWER -False
36. The sample is obtained in accordance to ASTM C . - CORRECT ANSWER -172
37. If the aggregate correction factor for a given source of fine and coarse aggregate is found to be 0.2
% in a pressure air meter, and an air content value of 5.0% is read on the gauge of the same air meter c
ontaining concrete with the same aggregate, what is the correct air content? - CORRECT ANSWER -4.8%
39. If the sample is vibrated the duration of vibration should last . - CORRECT ANSWER -
Until the surface concrete is smooth
40. The maximum size aggregate for this test is . - CORRECT ANSWER -2''
WITH CORRECT ANSWERS 2025
2. T/F: When the concrete contains large aggregate, the testing technician should wet-
sieve the sample before making unit weight tests for use in yield computations. - CORRECT ANSWER -
False
4. T/F: Samples smaller than 28L (1 cu.ft.) are allowed on routine air content, temperature, and slump t
ests. - CORRECT ANSWER -True
7. How do you regulate the rate of discharge of the batch from the revolving truck drum mixer or agitat
or? - CORRECT ANSWER -By the rate of revolution of the drum
10. While the technician is checking the slump of the concrete, there is a decided falling away or sheari
ng off of the concrete from one side of the sample. What should the technician do? -
CORRECT ANSWER -Disregard the test and retest on another portion of the sample
11. The mold is filled in three equal layers by volume, which makes the first third at , and the s
econd third at . - CORRECT ANSWER -2 5/8, 6 1/8
15. What is the difference allowed by ACI when certifying an individual test using a plastic slump cone v
s. a metal slump cone? - CORRECT ANSWER -0.5 inches
16. T/F: The sides of the slump mold should be lightly tapped to consolidate the concrete in the mold. -
CORRECT ANSWER -False
18. T/F: ASTM C 1064 defines the maximum recommended temperature for concrete. -
CORRECT ANSWER -False
19. The temperature test method must be complete with in after obtaining the sample. -
CORRECT ANSWER -5 minutes
, 20. Each temperature-
measuring device should be calibrated , or whenever there is a question of .-
CORRECT ANSWER -annually, accuracy
23. T/F: After strike off of the measure used to determine density, a small quantity of concrete may be
added to correct a deficiency? - CORRECT ANSWER -False
26. What is the required shape at the end of the tamping rod? - CORRECT ANSWER -
rounded to a hemispherical tip
28. How do you find the density of a concrete batch? - CORRECT ANSWER -
(mass of measure with concrete - mass of measure) / volume of measure
29. How do you find the yield of a concrete batch? - CORRECT ANSWER -
(mass of all materials batched / (density of concrete * 27))
33. T/F: Test method ASTM C231 is intended for use with all concretes and aggregates for which an agg
regate correction factor can be determined - CORRECT ANSWER -False
34. T/F: The petcocks are closed before pumping any air into the chamber on the type B meter. -
CORRECT ANSWER -False
36. The sample is obtained in accordance to ASTM C . - CORRECT ANSWER -172
37. If the aggregate correction factor for a given source of fine and coarse aggregate is found to be 0.2
% in a pressure air meter, and an air content value of 5.0% is read on the gauge of the same air meter c
ontaining concrete with the same aggregate, what is the correct air content? - CORRECT ANSWER -4.8%
39. If the sample is vibrated the duration of vibration should last . - CORRECT ANSWER -
Until the surface concrete is smooth
40. The maximum size aggregate for this test is . - CORRECT ANSWER -2''
